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Take Two For Hypersonic Combined-Cycle Propulsion

Citing advances in modeling and manufacturing, DARPA will try again to demonstrate a turbine-based combined-cycle (TBCC) engine that can operate from zero airspeed to beyond Mach 5, to power future air-breathing reusable hypersonic vehicles.
DARPA has launched the Advanced Full-Range Engine (AFRE) program, a two-phase effort planned to culminate in ground-based testing of a full-scale integrated technology-demonstrator system. Potential bidders will be briefed on the program on July 13-14 ...

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How many times are they going to start/stop TBCC development? It's getting ridiculous. If they're serious about it, they need to start throwing REAL money and resources at it, and not quit before the ink on the contract is dry.

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